We are having to add a new chiller/mechanical pad on top of an existing slope at a dam project. I have attached a rough sketch for reference. The pad size and loading conditions are not known at this point; and I know this will influence the foundation type. The existing slope consists of compacted earth fill, clayey sand [SC] with an effective friction angle around 33 degrees. Groundwater will not be an issue. The slope has been stable for 40+ years.
We were originally thinking to just constructing a reinforced earth wall (mse/segmental retaining wall) and ground supporting the slab; however, I think we may have issues with having to shore the soils adjacent to the existing parking and sidewalk area if the reinforcement extends far enough. We will also have to check slope stability for this case.
My second thought is to just install helical piles through the slope and support the mechanical equipment on a platform. I feel this would be quick and easy.
Which of these options do you think would be most cost effective?
We were originally thinking to just constructing a reinforced earth wall (mse/segmental retaining wall) and ground supporting the slab; however, I think we may have issues with having to shore the soils adjacent to the existing parking and sidewalk area if the reinforcement extends far enough. We will also have to check slope stability for this case.
My second thought is to just install helical piles through the slope and support the mechanical equipment on a platform. I feel this would be quick and easy.
Which of these options do you think would be most cost effective?
